accelbubble.qml Example File

  /****************************************************************************
  **
  ** Copyright (C) 2017 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the QtSensors module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** "Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/

  import QtQuick 2.1
  import QtQuick.Controls 1.0

  import QtSensors 5.0

  ApplicationWindow {
      title: "Accelerate Bubble"
      id: mainWindow
      width: 320
      height: 480
      visible: true
      readonly property double radians_to_degrees: 180 / Math.PI

      Accelerometer {
          id: accel
          dataRate: 100
          active:true

          onReadingChanged: {
              var newX = (bubble.x + calcRoll(accel.reading.x, accel.reading.y, accel.reading.z) * .1)
              var newY = (bubble.y - calcPitch(accel.reading.x, accel.reading.y, accel.reading.z) * .1)

              if (isNaN(newX) || isNaN(newY))
                  return;

              if (newX < 0)
                  newX = 0

              if (newX > mainWindow.width - bubble.width)
                  newX = mainWindow.width - bubble.width

              if (newY < 18)
                  newY = 18

              if (newY > mainWindow.height - bubble.height)
                  newY = mainWindow.height - bubble.height

                  bubble.x = newX
                  bubble.y = newY
          }
      }

      function calcPitch(x,y,z) {
          return -Math.atan2(y, Math.sqrt(x * x + z * z)) * mainWindow.radians_to_degrees;
      }
      function calcRoll(x,y,z) {
          return -Math.atan2(x, Math.sqrt(y * y + z * z)) * mainWindow.radians_to_degrees;
      }

      Image {
          id: bubble
          source: "content/Bluebubble.svg"
          smooth: true
          property real centerX: mainWindow.width / 2
          property real centerY: mainWindow.height / 2
          property real bubbleCenter: bubble.width / 2
          x: centerX - bubbleCenter
          y: centerY - bubbleCenter

          Behavior on y {
              SmoothedAnimation {
                  easing.type: Easing.Linear
                  duration: 100
              }
          }
          Behavior on x {
              SmoothedAnimation {
                  easing.type: Easing.Linear
                  duration: 100
              }
          }
      }
  }